mirror of
https://github.com/SerenityOS/serenity
synced 2024-07-09 01:30:46 +00:00
4332dfb964
I overlooked a corner case where we might call the built-in ctz() on zero.
Furthermore, the calculation of the shift was wrong and the results were often
unusable.
Both issue were caused by a forgotten 36daeee34f.
This time I made sure to look at bmpsuite_files first, and now they look good.
Found by OSS-Fuzz:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28985
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#ifdef __i386__
|
|
# define AK_ARCH_I386 1
|
|
#endif
|
|
|
|
#ifdef __x86_64__
|
|
# define AK_ARCH_X86_64 1
|
|
#endif
|
|
|
|
#if defined(__APPLE__) && defined(__MACH__)
|
|
# define AK_OS_MACOS
|
|
# define AK_OS_BSD_GENERIC
|
|
#endif
|
|
|
|
#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
|
|
# define AK_OS_BSD_GENERIC
|
|
#endif
|
|
|
|
#define ARCH(arch) (defined(AK_ARCH_##arch) && AK_ARCH_##arch)
|
|
|
|
#ifdef ALWAYS_INLINE
|
|
# undef ALWAYS_INLINE
|
|
#endif
|
|
#define ALWAYS_INLINE [[gnu::always_inline]] inline
|
|
|
|
#ifdef NEVER_INLINE
|
|
# undef NEVER_INLINE
|
|
#endif
|
|
#define NEVER_INLINE [[gnu::noinline]]
|
|
|
|
#ifdef FLATTEN
|
|
# undef FLATTEN
|
|
#endif
|
|
#define FLATTEN [[gnu::flatten]]
|
|
|
|
#ifdef NO_DISCARD
|
|
# undef NO_DISCARD
|
|
#endif
|
|
#define NO_DISCARD [[nodiscard]]
|
|
|
|
#ifndef __serenity__
|
|
# define PAGE_SIZE sysconf(_SC_PAGESIZE)
|
|
#endif
|
|
|
|
ALWAYS_INLINE int count_trailing_zeroes_32(unsigned int val)
|
|
{
|
|
#if defined(__GNUC__) || defined(__clang__)
|
|
return __builtin_ctz(val);
|
|
#else
|
|
for (u8 i = 0; i < 32; ++i) {
|
|
if ((val >> i) & 1) {
|
|
return i;
|
|
}
|
|
}
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
ALWAYS_INLINE int count_trailing_zeroes_32_safe(unsigned int val)
|
|
{
|
|
if (val == 0)
|
|
return 32;
|
|
return count_trailing_zeroes_32(val);
|
|
}
|
|
|
|
#ifdef AK_OS_BSD_GENERIC
|
|
# define CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC
|
|
# define CLOCK_REALTIME_COARSE CLOCK_REALTIME
|
|
#endif
|